Experimental status of the test of the gravitational inverse square law is reviewed, on the scope of probing the large extra-dimension. The relationship between the Yukawa parametrization and the power law parametrization is discussed. Direct tests on laboratory experiments and gravitational phenomena search at the LHC are compared on the same parametrization, which gives us a clear understanding of their sensitivities.
We study the Kondo effect in nuclear matter or in quark matter, where a heavy hadron or a heavy quark is embedded as an impurity particle at low temperature. We show that the effective coupling constants become enhanced at low energy scale (the Kondo scale), and present that the Kondo effect induces interesting non-perturbative phenomena.
Progress in semiconductor nano-fabrication technique has enabled us to observe in solids not only elementary quantum mechanical phenomena like the Aharonov-Bohm effect or the quantum tunneling effect, but also undiscovered particles or phenomena in particle physics. As a matter of practice, it is impossible to observe the trembling motion of relativistic electrons, which phenomenon called Zitterbewegung (ZB). However, the observation of ZB as a solid-state phenomenon has been seriously considered. Various types of ZB have been predicted, one of which is the meandering motion of electrons in quantum wells with the Rashba-type spin-orbit interaction. In the present study, we have observed ZB in an InAs quantum well as a conductance fluctuation in a spin-polarized semi-ballistic transport provided by quantum point contact electrodes.
We experimentally investigate the convection dynamics using several different fluids and find that transient stagnant domain is formed during thermal convection in well-mixed two component fluids. In addition, we find that difference in viscosity between the two components is one of the most important factors for the formation of transient stagnant domain. We conclude that the dynamical asymmetry plays an important role in the thermal convection with two-component fluid mixture.